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First of all this has nothing to do with facebook and as much as I don't like them myself I can say they are not to blame for this. It's just a coincidence and/or mis-understanding of the data you are interpreting.

The CBL (Composite Block List) is a site that,
"lists IPs exhibiting characteristics which are specific to open proxies of various sorts (HTTP, socks, AnalogX, wingate etc) and dedicated Spam BOTs which have been abused to send spam, worms/viruses that do their own direct mail transmission, or some types of trojan-horse or "stealth" spamware, dictionary mail harvesters etc."
In other words if an IP address is found to do any of what is quoted above it gets listed in the CBL. Servers, almost exclusively mail servers can check an IP address against the CBL before accepting a email. If it's listed the email is blocked. It's a Spam/Virus/Trojan prevention measure. I use it on my mail server as one of many defences against that sort of thing.

Because the IP address you are assigned is dynamic all this means is that someone who had the IP address before you was probably running a compromised machine that was sending out Spam that was caught in one of the CBL honeypots and the IP address was blacklisted.

Now, it's unusual for a web site to use the CBL to block visitors, as I said it's usually only mail servers that make use of it, so what you are experiencing is very unusual. If anything, using the CBL to block web site visitors is a mis-use of the CBL and, in this case, the blame should squarely be put on the site admins of the web site you are visiting. About the only thing you can do is to disconnect/reconnect the Rocket Stick so it gets assigned a new IP address that is not the one that is listed. The other thing you could do is use the CBL Lookup and Removal but that will take too long. It's much quicker to just get a new IP address.

Rogers tech support won't be able to do anything for you which is why they reacted the way they did. They are not going to keep track of everyone who was assigned that IP address before you and try and figure out which one was the compromised machine.
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